At least two photos have come to light showing Sandy Hook parent, Mark Barden outfitted as an FBI swat team member on the day of the Sandy Hook shooting. In addition to the photo referenced in the video, another photo of Barden dressed as such can be seen in this article on Daily Mail Online:
http://www.dailymail.co.uk/news/article-2248197/Adam-Lanza-How-honor-student-goth-killer-massacring-20-children-Sandy-Hook-Elementary.html. This same photo can also be found in the Getty images archive (in connection with the Sandy Hook incident).
NOTE: Many Sandy Hook researchers have concluded that Sandy Hook parent David Wheeler was also seen outfitted as an FBI swat team member; however, this has been debunked (at least to my satisfaction). Apparently numerous videos can be found that show the FBI swat team member purported to be Wheeler in the process of "suiting up". One such video can be found on the WSJ website:
http://www.wsj.com/video/children-evacuated-from-school-to-nearby-firehouse/9765508C-4E46-4EA7-9D8A-51AED89D6675.html. The individual in question can be seen at various points in the video. Two things are strikingly obvious: First, his "body type" is quite different and he is heavier than Wheeler. Secondly, unlike Wheeler, the individual seen is completely bald. Sure, the man could still be David Wheeler but I think that the footage casts serious doubt that it's actually him. In the end, it's a moot point because one thing that we know for a fact is that David Wheeler has acting experience and prior to the recent scrubbing of Sandy Hook information across the web, he even had a presence on IMDB.